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A012592 as a simple table

na(n)
00
11
22
34
424
5188
61480
714824
8182784
92495632
1037988128
11649646336
1212226037120
13250202750016
145549572352896
15132663174885760
163396998634659840
1792768709569362176
182691992696956801536

[0,1,2,4,24,188,1480,14824,182784,2495632,
 37988128,649646336,12226037120,250202750016,
 5549572352896,132663174885760,3396998634659840,
 92768709569362176,2691992696956801536]